[PATCH] libertas: single out mesh code

This patches adds the two functions wlan_add_mesh() and wlan_remove_mesh(),
which are responsible for the mshX interface. In a CF driver with a non-
mesh-aware firmware you can omit the calls to this functions.

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

5 files changed, 104 insertions, 47 deletions

diff --git a/drivers/net/wireless/libertas/cmdresp.c b/drivers/net/wireless/libertas/cmdresp.c
index 9509b8ef626..c8fce7bf668 100644
--- a/drivers/net/wireless/libertas/cmdresp.c
+++ b/drivers/net/wireless/libertas/cmdresp.c
@@ -220,7 +220,9 @@ static int wlan_ret_get_hw_spec(wlan_private * priv,
         }
 
         memcpy(priv->wlan_dev.netdev->dev_addr, adapter->current_addr, ETH_ALEN);
-        memcpy(priv->mesh_dev->dev_addr, adapter->current_addr, ETH_ALEN);
+        if (priv->mesh_dev)
+                memcpy(priv->mesh_dev->dev_addr, adapter->current_addr,
+                       ETH_ALEN);
 
         if (libertas_set_regiontable(priv, adapter->regioncode, 0)) {
                 ret = -1;
diff --git a/drivers/net/wireless/libertas/decl.h b/drivers/net/wireless/libertas/decl.h
index dfe27642322..9eed599f09a 100644
--- a/drivers/net/wireless/libertas/decl.h
+++ b/drivers/net/wireless/libertas/decl.h
@@ -79,5 +79,7 @@ extern struct chan_freq_power *libertas_get_region_cfp_table(u8 region, u8 band,
                                                              int *cfp_no);
 wlan_private *wlan_add_card(void *card);
 int wlan_remove_card(void *card);
+int wlan_add_mesh(wlan_private *priv);
+void wlan_remove_mesh(wlan_private *priv);
 
 #endif                          /* _WLAN_DECL_H_ */
diff --git a/drivers/net/wireless/libertas/if_usb.c b/drivers/net/wireless/libertas/if_usb.c
index 208d2570004..c1a662b065b 100644
--- a/drivers/net/wireless/libertas/if_usb.c
+++ b/drivers/net/wireless/libertas/if_usb.c
@@ -99,7 +99,7 @@ static int if_usb_probe(struct usb_interface *intf,
         struct usb_device *udev;
         struct usb_host_interface *iface_desc;
         struct usb_endpoint_descriptor *endpoint;
-        wlan_private *pwlanpriv;
+        wlan_private *priv;
         struct usb_card_rec *usb_cardp;
         int i;
 
@@ -187,7 +187,9 @@ static int if_usb_probe(struct usb_interface *intf,
          * about keeping pwlanpriv around since it will be set on our
          * usb device data in -> add() -> libertas_sbi_register_dev().
          */
-        if (!(pwlanpriv = wlan_add_card(usb_cardp)))
+        if (!(priv = wlan_add_card(usb_cardp)))
+                goto dealloc;
+        if (wlan_add_mesh(priv))
                 goto dealloc;
 
         usb_get_dev(udev);
@@ -228,6 +230,7 @@ static void if_usb_disconnect(struct usb_interface *intf)
 
         /* card is removed and we can call wlan_remove_card */
         lbs_deb_usbd(&cardp->udev->dev, "call remove card\n");
+        wlan_remove_mesh(priv);
         wlan_remove_card(cardp);
 
         /* Unlink and free urb */
diff --git a/drivers/net/wireless/libertas/main.c b/drivers/net/wireless/libertas/main.c
index 6fcb2bdfbed..abba7ec499b 100644
--- a/drivers/net/wireless/libertas/main.c
+++ b/drivers/net/wireless/libertas/main.c
@@ -208,7 +208,6 @@ static ssize_t libertas_mpp_set(struct device * dev,
                 struct device_attribute *attr, const char * buf, size_t count) {
         struct cmd_ds_mesh_access mesh_access;
 
-
         memset(&mesh_access, 0, sizeof(mesh_access));
         sscanf(buf, "%d", &(mesh_access.data[0]));
         libertas_prepare_and_send_command((to_net_dev(dev))->priv,
@@ -287,7 +286,7 @@ static int mesh_open(struct net_device *dev)
 {
         wlan_private *priv = (wlan_private *) dev->priv ;
 
-        if(pre_open_check(dev) == -1)
+        if (pre_open_check(dev) == -1)
                 return -1;
         priv->mesh_open = 1 ;
         netif_start_queue(priv->mesh_dev);
@@ -352,7 +351,8 @@ static int mesh_close(struct net_device *dev)
  *  @param dev     A pointer to net_device structure
  *  @return        0
  */
-static int wlan_close(struct net_device *dev) {
+static int wlan_close(struct net_device *dev)
+{
         wlan_private *priv = (wlan_private *) dev->priv;
 
         netif_stop_queue(priv->wlan_dev.netdev);
@@ -487,7 +487,8 @@ static int wlan_set_mac_address(struct net_device *dev, void *addr)
 
         lbs_dbg_hex("adapter->macaddr:", adapter->current_addr, ETH_ALEN);
         memcpy(dev->dev_addr, adapter->current_addr, ETH_ALEN);
-        memcpy(((wlan_private *) dev->priv)->mesh_dev->dev_addr, adapter->current_addr, ETH_ALEN);
+        if (priv->mesh_dev)
+                memcpy(priv->mesh_dev->dev_addr, adapter->current_addr, ETH_ALEN);
 
 done:
         lbs_deb_leave_args(LBS_DEB_NET, "ret %d", ret);
@@ -767,7 +768,6 @@ static int wlan_service_main_thread(void *data)
 wlan_private *wlan_add_card(void *card)
 {
         struct net_device *dev = NULL;
-        struct net_device *mesh_dev = NULL;
         wlan_private *priv = NULL;
 
         lbs_deb_enter(LBS_DEB_NET);
@@ -786,15 +786,6 @@ wlan_private *wlan_add_card(void *card)
                 goto err_kmalloc;
         }
 
-        /* Allocate a virtual mesh device */
-        if (!(mesh_dev = alloc_netdev(0, "msh%d", ether_setup))) {
-                lbs_deb_mesh("init mshX device failed\n");
-                return NULL;
-        }
-
-        /* Both intervaces share the priv structure */
-        mesh_dev->priv = priv;
-
         /* init wlan_adapter */
         memset(priv->adapter, 0, sizeof(wlan_adapter));
 
@@ -802,10 +793,8 @@ wlan_private *wlan_add_card(void *card)
         priv->wlan_dev.card = card;
         priv->mesh_open = 0;
         priv->infra_open = 0;
-        priv->mesh_dev = mesh_dev;
 
         SET_MODULE_OWNER(dev);
-        SET_MODULE_OWNER(mesh_dev);
 
         /* Setup the OS Interface to our functions */
         dev->open = wlan_open;
@@ -813,12 +802,6 @@ wlan_private *wlan_add_card(void *card)
         dev->stop = wlan_close;
         dev->do_ioctl = libertas_do_ioctl;
         dev->set_mac_address = wlan_set_mac_address;
-        mesh_dev->open = mesh_open;
-        mesh_dev->hard_start_xmit = mesh_pre_start_xmit;
-        mesh_dev->stop = mesh_close;
-        mesh_dev->do_ioctl = libertas_do_ioctl;
-        memcpy(mesh_dev->dev_addr, priv->wlan_dev.netdev->dev_addr,
-                        sizeof(priv->wlan_dev.netdev->dev_addr));
 
 #define WLAN_WATCHDOG_TIMEOUT   (5 * HZ)
 
@@ -826,12 +809,9 @@ wlan_private *wlan_add_card(void *card)
         dev->get_stats = wlan_get_stats;
         dev->watchdog_timeo = WLAN_WATCHDOG_TIMEOUT;
         dev->ethtool_ops = &libertas_ethtool_ops;
-        mesh_dev->get_stats = wlan_get_stats;
-        mesh_dev->ethtool_ops = &libertas_ethtool_ops;
 
 #ifdef  WIRELESS_EXT
         dev->wireless_handlers = (struct iw_handler_def *)&libertas_handler_def;
-        mesh_dev->wireless_handlers = (struct iw_handler_def *)&libertas_handler_def;
 #endif
 #define NETIF_F_DYNALLOC 16
         dev->features |= NETIF_F_DYNALLOC;
@@ -875,12 +855,6 @@ wlan_private *wlan_add_card(void *card)
                 goto err_init_fw;
         }
 
-        /* Register virtual mesh interface */
-        if (register_netdev(mesh_dev)) {
-                lbs_pr_err("cannot register mshX virtual interface\n");
-                goto err_init_fw;
-        }
-
         lbs_pr_info("%s: Marvell WLAN 802.11 adapter\n", dev->name);
 
         libertas_debugfs_init_one(priv, dev);
@@ -889,14 +863,10 @@ wlan_private *wlan_add_card(void *card)
                 goto err_init_fw;
         libertas_devs[libertas_found] = dev;
         libertas_found++;
-        if (device_create_file(&(mesh_dev->dev), &dev_attr_libertas_mpp))
-                goto err_create_file;
 
         lbs_deb_leave_args(LBS_DEB_NET, "priv %p", priv);
         return priv;
 
-err_create_file:
-        device_remove_file(&(mesh_dev->dev), &dev_attr_libertas_mpp);
 err_init_fw:
         libertas_sbi_unregister_dev(priv);
 err_registerdev:
@@ -907,12 +877,76 @@ err_registerdev:
         kfree(priv->adapter);
 err_kmalloc:
         free_netdev(dev);
-        free_netdev(mesh_dev);
 
         lbs_deb_leave_args(LBS_DEB_NET, "priv NULL");
         return NULL;
 }
 
+/**
+ * @brief This function adds mshX interface
+ *
+ *  @param priv    A pointer to the wlan_private structure
+ *  @return        0 if successful, -X otherwise
+ */
+int wlan_add_mesh(wlan_private *priv)
+{
+        struct net_device *mesh_dev = NULL;
+        int ret = 0;
+
+        lbs_deb_enter(LBS_DEB_MESH);
+
+        /* Allocate a virtual mesh device */
+        if (!(mesh_dev = alloc_netdev(0, "msh%d", ether_setup))) {
+                lbs_deb_mesh("init mshX device failed\n");
+                ret = -ENOMEM;
+                goto done;
+        }
+        mesh_dev->priv = priv;
+        priv->mesh_dev = mesh_dev;
+
+        SET_MODULE_OWNER(mesh_dev);
+
+        mesh_dev->open = mesh_open;
+        mesh_dev->hard_start_xmit = mesh_pre_start_xmit;
+        mesh_dev->stop = mesh_close;
+        mesh_dev->do_ioctl = libertas_do_ioctl;
+        mesh_dev->get_stats = wlan_get_stats;
+        mesh_dev->ethtool_ops = &libertas_ethtool_ops;
+        memcpy(mesh_dev->dev_addr, priv->wlan_dev.netdev->dev_addr,
+                        sizeof(priv->wlan_dev.netdev->dev_addr));
+
+#ifdef  WIRELESS_EXT
+        mesh_dev->wireless_handlers = (struct iw_handler_def *)&libertas_handler_def;
+#endif
+#define NETIF_F_DYNALLOC 16
+
+        /* Register virtual mesh interface */
+        ret = register_netdev(mesh_dev);
+        if (ret) {
+                lbs_pr_err("cannot register mshX virtual interface\n");
+                goto err_free;
+        }
+
+        ret = device_create_file(&(mesh_dev->dev), &dev_attr_libertas_mpp);
+        if (ret)
+                goto err_unregister;
+
+        /* Everything successful */
+        ret = 0;
+        goto done;
+
+
+err_unregister:
+        unregister_netdev(mesh_dev);
+
+err_free:
+        free_netdev(mesh_dev);
+
+done:
+        lbs_deb_leave_args(LBS_DEB_MESH, "ret %d", ret);
+        return ret;
+}
+
 static void wake_pending_cmdnodes(wlan_private *priv)
 {
         struct cmd_ctrl_node *cmdnode;
@@ -934,7 +968,6 @@ int wlan_remove_card(void *card)
         wlan_private *priv = libertas_sbi_get_priv(card);
         wlan_adapter *adapter;
         struct net_device *dev;
-        struct net_device *mesh_dev;
         union iwreq_data wrqu;
         int i;
 
@@ -949,16 +982,12 @@ int wlan_remove_card(void *card)
                 goto out;
 
         dev = priv->wlan_dev.netdev;
-        mesh_dev = priv->mesh_dev;
 
-        netif_stop_queue(mesh_dev);
         netif_stop_queue(priv->wlan_dev.netdev);
         netif_carrier_off(priv->wlan_dev.netdev);
 
         wake_pending_cmdnodes(priv);
 
-        device_remove_file(&(mesh_dev->dev), &dev_attr_libertas_mpp);
-        unregister_netdev(mesh_dev);
         unregister_netdev(dev);
 
         cancel_delayed_work(&priv->assoc_work);
@@ -994,8 +1023,6 @@ int wlan_remove_card(void *card)
         lbs_deb_net("unregister finish\n");
 
         priv->wlan_dev.netdev = NULL;
-        priv->mesh_dev = NULL ;
-        free_netdev(mesh_dev);
         free_netdev(dev);
 
 out:
@@ -1003,6 +1030,29 @@ out:
         return 0;
 }
 
+void wlan_remove_mesh(wlan_private *priv)
+{
+        struct net_device *mesh_dev;
+
+        lbs_deb_enter(LBS_DEB_NET);
+
+        if (!priv)
+                goto out;
+
+        mesh_dev = priv->mesh_dev;
+
+        netif_stop_queue(mesh_dev);
+
+        device_remove_file(&(mesh_dev->dev), &dev_attr_libertas_mpp);
+        unregister_netdev(mesh_dev);
+
+        priv->mesh_dev = NULL ;
+        free_netdev(mesh_dev);
+
+out:
+        lbs_deb_leave(LBS_DEB_NET);
+}
+
 /**
  *  @brief This function finds the CFP in
  *  region_cfp_table based on region and band parameter.
diff --git a/drivers/net/wireless/libertas/rx.c b/drivers/net/wireless/libertas/rx.c
index 371cbf17ad4..a0779dc7828 100644
--- a/drivers/net/wireless/libertas/rx.c
+++ b/drivers/net/wireless/libertas/rx.c
@@ -140,7 +140,7 @@ void libertas_upload_rx_packet(wlan_private * priv, struct sk_buff *skb)
 {
         lbs_deb_rx("skb->data %p\n", skb->data);
 
-        if(IS_MESH_FRAME(skb))
+        if (priv->mesh_dev && IS_MESH_FRAME(skb))
                 skb->dev = priv->mesh_dev;
         else
                 skb->dev = priv->wlan_dev.netdev;